html{height: 100%;}
body.signin {
    background: #edf2f6;
    height: auto;
    background:url("../images/login-background.jpg") no-repeat center fixed;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
}

/* 登陆 */
.login_con{width:500px;margin:0 auto;margin-top:12%;padding:50px;background-color:rgba(89, 89, 89, 0.5);}
.captcha{display: block; overflow: hidden;}
.captcha input{width:40%; float: left; color: #333; margin-top: 3px;}
.captcha img{width:130px;height:40px;float: left;margin-left: 10px;}
.captcha span{width:90px;line-height: 40px; float: right}
.captcha span a{color: #fff;cursor: pointer;}
.captcha span a:hover{text-decoration: underline; }
